X c cohpaott



c. BRAMMING.

cowwgcm ma moms cmcunsr APPLICATION FILED JAN. 18, I917. RENEWEDJU NE 30. I919.

Patented 9m. 9, 1919.

2 SHEETS-SHEET 1.

C. BBAIVIM'ING. CONNECTOR FOR ELECTRIC CIRCUITS. APPLICATION FILED IAN. 1-8. 1911. RENEWED JUNE 30. 1919.

Patented $911113. 9,1919;

2 SHEETS-SHEET 2 mwwmmwum MWW. m

CARL BRAMMING, OFEHICAGQdLIiINOIS, ASSIGNOR T ACCESSORIES MANUFACTURING v 7 COMPANY. A CORPORATION OF ILLINOIS.

GONNJECTQR FOR ELECTRIC CIRCUITS.

eis-nos.

Specification of Letters Patent.

Patented Sept. 9, ldld.

Application filed January 18, 1917, Serial No. 143,032. Renewed June 30, 1919. Serial No. 307,?77.

To all 107mm itmcg concern:

Be it known that 1,-CARL BRAMMING, a

' citizen of the United States,-and resident of,

, cation and which are illustrated in. the accompanying drawings, forming a part.

thereof.

' The invention relates to a connector of the plug and socket type, and is shown in connection with a socket adapted to receive a plug or lamp base at one end and a plug or terminal carrier at the other;

. The objects of the invention are to provide an improved form of bayonet joint lock to permit the terminal plug to be .par-

' tially withdrawn for the purpose of openis shown'in connection-with the body of a lamp 11, with 'which' it is attached in the'j usual manner, although the device may be longitudinally ofthcfplug.

ing the circuit, while still being held within the socket, and to provide improved means withdrawn positlon.

for firmly holding the plug in its partially Preferred forms of embodiment of the invention are hereinafter described and shown in the accompanying draw ngs, in wh1ch- Fig. .2 is a side view of the connectorremoved from the lamp;". p

Fi 3 is a sectional view on the line 3- -3 of Flg. 2,the electric circuit being shown partly diagrammatically;

"Fig. 4 'is a view similarto Fig. 2, showing a modified form of construction;

. Fig.- 5 is a view similar to Fig. 3,show- 'ing amodified form of COIlSlZI'llCtlOIl; and

Fig, 6 is a sectional view" 011 the line 66 of Fig. 5. j

Referring to Fig. 1, the socket element 10 utilized in other situations, as' onthe dash or cowl of an automobile, n.wh1ch case the plug 12 would be the attached element. The plugis provided with two pairs of oppositely disposed laterally projecting studs 1 3, 14,,adaptedto cooperate with the bayonet joint slots of the socket, the two members of each set being arranged substantially in line The bayonetT'joi tslots lfi 'inl the sb cket element enter obliquely from the end at the socket, asshoWn at 16, and at the inner end of the oblique portion are offset backwardly to form a shoulder 17 for engagement by the studs in alternation. The margin of the slot forming a continuation of the opposite side of the oblique portion, after extending inwardly a short distance, is curved back- Wardly to form a cam surface 18. As the plug is inserted the studs enter the slot, and as the forward stud 1% slides down the cam 18 "the plug is turned sufficiently to bring the stud 13 in position for engagement with the'shoulder L7. in order to shift the plug to its second or partially withdrawn position, it is turned slightly to the right to disengage the stud from the shoulder, and, being released, the sprlng mechanism, hereinafter descrlbed, w1th1n the socket forces it backwardly, the stud 13 passing outward through "3, the socket" 10 is provided substantially midway of its ends with a fixed plateor Figure 1 is aside elevation of. a lamp equipped ,with'theimproved connector;

block 19 of insulating material, througli which .reciprocates a hollow contact element 20 adapted to coiiperate With the plug contact. A second hollow contact 21 telescopically interfits the contact 20, and a ordinary form of bayonet joint, as represented at 24, the central contact 25 of the base ofthe lamp engaging the contact 21.

The plug 12is recessed from its inner end,

and for convenience of manufacture may "st of a piece of tubing with a block of lnsulating material26 fitted in the outer end thereof A terminalrod 27, located on a the axis of'the plug, is fixed within the block 26, end extending preferably to the inner. fendof ithe plug, as shown. This terminal" engages the contact 20, compressing the {spring 22, and isheld .in engagement therewith by the engagement oi the outer studs 3 with the sliouldersl-lflrofthe socket slots.- An annular disk 28]slidinglyfits within the shell ofjthe plug"IQ-IanduPQnthe rod 27',

and. is'nrged' tewardjtheinireiilend of the fplug by a helical spring 29 encircling the rod27 and reacting" against the block 26.

contact 20, being spread apart to permit the The end of the rod 2.7 .is preferably slightly enlarged to form a shoulder to limit the outwardmovement of thedisk 28.

A pair "of fingers 31,- 32, extend from the i entry between them of the plug terminal, the

ends of these fingers engaging the disk 28 and forcing it inwardly asthe plug is insertv ,ed'intothe socket, Upon the release of the stud 13 from the'shoulder 17 in the manner hereinbefore. described, the plug is forced backwar'dly by the action of thespring 29, the pressure of which then holds the stud 14 in engagement with the shoulder-17. The

"outer end of the rod 27 is centrally bored to g receive the leading-in wire 33, which may be dicated'at 35. 25

secured by means of a screw 34 set through the block 26 and entering the bore of the rod. The return circuit from the bulb 23 maybe through the shellof its base and the wall-of the'socket,.which is grounded, as in- In the construction illustrated in Figs. 5

. and 6, all of.the parts are the same as shown in Fig. 3, except that a single stud 36, 37,

projects from each side of the plug, cooperating with a bayonet joint slot 38 of known form, provided with two shoulders 39, 40, spaced longitudinally of the socket,

the one for holding the plug inits fully inserted' and the other in-its partially inserted position; a further deviation from the construction of Fig. 1 .being the substitution, for the fingers 31, 32, of an abutment 41 for engagement with the disk 28 and taking the form of a tube seated upon the block 19 and secured thereto by means of fingers 42,

43, extending through the block and clenched at the farther side thereof; By this arrange- I ment the abutment is insulated from the contact 20. This form of abutment is preferable tothat shown in Fig.3, and will, of course, cooperate with either of the forms of bayonet joint lock shown, as will also the some cities requiring the location. of' the .switch for the tail lamp at the rear of the car.

,While preferred forms of the invention are shown, changes of detail may be made without departing from its scope.

I claim asmy invention 1. In a circuit connector, in combination, a. socket having bayonet joint slots, an internal fixed abutment, a yielding contact I end thereof and housed in the abutment, and a member PI'O'.

'jecting from the abutment beyond the end of the terminal, a plug recessed atits .inner end adapted to'enter'the socket and having lateral studs cooperating with the bayonet joint slots, a terminal bar fixed within the plug recess, a member slidable within the recess and adapted to engage the projecting member, and a spring urging the slidable member toward the end of the plug. j

2. In a circuit connector, in combination, a socket having bayonet joint slots, a block of non-conductive material fixed within the socket, a yielding contact mounted in and projecting from the block and located on the axis of the socket, a rigid abutment projecting from the block beyond the end of the terminal a hollow plug interfitting' the socket and having lateral studs cooperating with the bayonet joint slots, an annular plate slidable' within the plug chamber, a spring reacting between the plate and a fixed abutment in the plug, and a terminal bar on the axis of the plug and fixed in the outer projecting through the annular plate.

3. In a circuit connector, in combination, a socket having bayonet joint slots, each of such, slots bein extended inwardly beyond its stud-engaging shoulder, a plug interfittingthe socket and having a pair of longitudinall'y spaced lateral studs for cooperating witheach slot, and spring means for holding such studs alternatively in en'gage- I ment with the slot shoulders.

. 4. In a c1rcu1t connector, in combination, a socket having bayonet oint slots, each of such slots being extended inwardly beyondits stud-engaging shoulder, a plug interfitting the socket and having a pair of longitudinally spaced lateral studs for cooperating with each slot, cooperating terminals carried, respectively, by the socket and plug, a spring housed Within the plug, a bearing plate adjacent the inner end of the plug and engaging the spring, and afixed abutment in the socket engageable with the bearing plate, the spring and abutmentcooperating to hold the studs adjacent the end of the plug in engagement with the bayonet joint shoulder.

5. In a circuit connector, in combination, a socket having bayonet joint slots, each slot entering obliquelyfron'i the socket end, the inner end of the slot bein enlarged by a lateral extension backward y from the oblique portion and the opposite wall of the inner portion of the slot being inwardly inclined; a plug interfitting the socket and having two pairs of longitudinally spaced and alined lateral studs cooperating with the bayonet joint slots, 'the studs of each pair being adapted to engage the slot shoulder in alternation. g 6. In a. circuit connector, in combination,

:1 socket having bayonet joint slate, each slot having two peirs of longitliclinally spaced entering obliquely from the socket end, the and alined lateral studs coiiperating with inner end of the slot being enlarged by a the bayonet joint slots, the studs of each 10 lateral extension backwardly from the 0bpair being adapted to engage the slot shoulliqne portion and the opposite Wall of the (ler in alternation, and spring means for inner portion of the slot being inwardly i11 holding the plug in eaeh of its positions. clined; e plug interfitting the socket and CARL BRMHHNG. 

